georefid:2012-073117SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1130/G32785.12012-01-01publicationgeorefid:2012-073117doi:10.1130/G32785.1John, Cedric M.Imperial College London, Department of Earth Science and Engineering, London, United KingdomauthorBanerjee, Neil R.University of Western Ontario, CanadaauthorLongstaffe, Fred J.University of California at Santa Cruz, United StatesauthorSica, CheyenneauthorLaw, Kimberley R.authorZachos, James C.authorGeological Society of America (GSA), Boulder, CO, United StatespublisherdocumentHardcopyGeology (Boulder)40 (7)591-594The Paleocene-Eocene thermal maximum, a transient global warming event, is characterized by extensive evidence of a more active hydrological cycle. This includes a widespread pulse of kaolinite accumulation on continental margins, viewed as the by-product of either enhanced chemical weathering consistent with much more humid conditions and/or increased erosion of previously deposited laterites. The former would be more consistent with year-round humid conditions, whereas the latter might be indicative of extreme seasonal precipitation patterns. To assess these hypotheses, we present a new high-resolution clay mineral assemblage and oxygen isotope record from Bass River, a site on the New Jersey margin (east coast of North America), which shows a sharp rise in the abundance of kaolinite beginning a few thousand years before the onset of the carbon isotope excursion (CIE). The delta (super 18) O of the <2-mu m-size fraction exhibits a shift toward lower values during the event. On the basis of a coeval shift in clay assemblages, the shift in delta (super 18) O (sub Clays) can be explained by a shift in the relative percent of the primary clay phases rather than a change in the isotopic composition of kaolinite, as would be expected if the kaolinite had been produced primarily during the Paleocene-Eocene thermal maximum. This finding points to accelerated exhumation and erosion of kaolinitic soils, most likely Cretaceous laterites.completedStratigraphyIsotope geochemistryAtlantic Coastal PlainBass RiverBurlington County New JerseyCenozoicchemostratigraphyclay mineralogyclay mineralsclimate changecoresgeochemistryglobal changeglobal warminghigh-resolution methodsisotope ratiosisotopeskaoliniteLeg 174AXNew JerseyO-18/O-16Ocean Drilling ProgramoxygenPaleocene-Eocene Thermal MaximumpaleoclimatologyPaleogenepaleotemperaturesedimentationsedimentation ratessheet silicatessilicatesstable isotopesTertiaryUnited StatesweatheringEnglishgeoscientificInformation-75.3500-74.000038.300040.1500With GSA Data Repository Item 2012184; accessed on July 26, 2012